221225755 has 8 divisors (see below), whose sum is σ = 271644912. Its totient is φ = 172864608.

The previous prime is 221225747. The next prime is 221225789. The reversal of 221225755 is 557522122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221225755 - 2³ = 221225747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 514264 + ... + 514693.

It is an arithmetic number, because the mean of its divisors is an integer number (33955614).

Almost surely, 2^221225755 is an apocalyptic number.

221225755 is a deficient number, since it is larger than the sum of its proper divisors (50419157).

221225755 is a wasteful number, since it uses less digits than its factorization.

221225755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029005.

The product of its digits is 14000, while the sum is 31.

The square root of 221225755 is about 14873.6597715559. The cubic root of 221225755 is about 604.8001571131.

Adding to 221225755 its reverse (557522122), we get a palindrome (778747877).

The spelling of 221225755 in words is "two hundred twenty-one million, two hundred twenty-five thousand, seven hundred fifty-five".